Sökning: "polytetrafluoroethylene"

Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet polytetrafluoroethylene.

  1. 1. Survival of onlay bone grafts. A study in the adult rat

    Författare :Monica Gordh; Lunds universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; rats; polytetrafluoroethylene; artificial; membrane; immunohistochemistry; cortical perforations; bone morphogenetic protein; bone marrow; bone; bone grafts; Odontologi; stomatology; Odontology; skull; tibia;

    Sammanfattning : The aim of this thesis was to study onlay bone grafting in the adult rat to improve graft incorporation and perservation of graft size. In 167 adult isogeneic lewis rats, the size maintenance and bone formation at the graft-host interface of uni- and bicortical onlays positioned in various environments and treatments were investigated. LÄS MER

  2. 2. A clinical study of uncemented hip arthroplasty : Radiological findings of host-bone reaction to the stem

    Författare :Henrik Bodén; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; Arthroplasty; bone remodelling; DEXA; fixation; geometrical design; hydroxyapatite; osteoarthritis; scintigraphy; stem size; stress-shielding; tapered; titanium; uncemented; weight-bearing.;

    Sammanfattning : In total hip arthroplasty (THA), the main reason for failure leading to revision is aseptic loosening. Both mechanical and biological effects act in the loosening process, the factors may be implant design, fixation mode or technique, as well as biological factors unique to the individual. LÄS MER

  3. 3. Blood-Graft Interactions: With special reference to cellular immune-reactivity in vascular and endovascular surgery

    Författare :Paul Swartbol; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; traumatology; orthopaedics; Surgery; Inflammatory responses; Immunology; Grafts; Vascular; Endovascular; Kirurgi; ortopedi; traumatologi; serology; transplantation; Immunologi; serologi;

    Sammanfattning : The expression of surface adhesion molecules on white blood cells (WBC) and platelets, and the release of tumor necrosis factor-alpha (TNF-a) and interleukin-6 (IL-6) after incubation with expanded-polytetrafluoroethylene (ePTFE)- or woven Dacron grafts was determined. Both graft-materials induced alteration of the WBC adhesion molecule receptor and caused release of TNF-a and IL-6, higher for woven Dacron as compared to ePTFE. LÄS MER

  4. 4. Environmental Life-cycle Assessment in Microelectronics Packaging

    Författare :Anders Andrae; Chalmers University of Technology; []
    Nyckelord :System-In-a-Package; microelectronics packaging; data collection; attributional environmental life-cycle assessment; uncertainty analysis; upstream processes; consequential life-cycle assessment; environmental life-cycle inventory; microelectronic products;

    Sammanfattning : An increased understanding of the application of environmental Life-Cycle Assessment (LCA) methodologies in the microelectronics packaging area should help in developing environmentally sound product systems. The aim of the present thesis is to increase the knowledge of using LCA tools, methods and models, in application to current and new microelectronic products. LÄS MER

  5. 5. On the inception and propagation of streamers along mineral-oil/solid interfaces

    Författare :David Ariza; Marley Becerra; Olivier Lesaint; KTH; []
    Nyckelord :;

    Sammanfattning : This thesis presents an experimental study of positive and negativestreamers propagating along mineral-oil/solid interfaces under square highvoltage pulses. The thesis includes the design and construction of anexperimental setup to studying the streamers in a point-plane configurationcapable to detect streamer parameters such as velocity, length, propagationtime, emitted light and charge. LÄS MER